Fixed telephony

See also: Telephone (homonymy)

The fixed telephony is the use of telephony so that calling it and called cannot move place where they are. The voice is transmitted by Electric wire, at least of the subscriber until the Répartiteur. It is the first use of the Téléphone, before the appearance of the Mobile telephony.

Technologies

  • Phone network commutated

  • Voice by IP, nevertheless so usable in Mobile telephony

The telegraphic Téléphonie uses several Technique S, the first is the Modulation low frequency of carrying running on a two-wire Ligne. The second, the supply central battery and the third is that of the commutated lines.

In short, the telephones, to be able to transmit the voices of their users, are supplied by a food delivering 48 Volt S located at the telephone center and, outputting a D.C. current of a score of Milli - amp S, via a line of two wire, commutable with other lines via a electromechanical Commutateur or electronic.

Format of the national numbers for France:

In France, the telephone numbers are the form 0ZABPQMCDU , where:

  • Z is the Zone
  • AB defines the Area
  • PQ represents the autonomous center of routing
  • MCDU is a number with 4 digits identifying the final subscriber on the center of routing (a Thousand, Hundred, Dizaine, Unité)

Telephone operators fixes in France

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